Bestt avaeable copy



r ATTORNEY msr'AvAmBLE'coPY w. H. SMITH.

EL APPLICATION SILEQ JUNE I3. 19!!- 1,312,75f7a Y Patented Aug. 12, 1919.

INVENTOR Walter/15ml)?! flcii mx I tiresome To al l whom it may concern Be it known that. I, WAnrnR H. SMITH, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement inRelays, of

which the following is a specification.

My invention relates to relays and particularly to relays for protecting the motor circuits of electrically operated vehicles.

iley conductor or crosses a break therein and for locking the relay in its inoperative position after it has functioned to open the switch upon the occurrence of an overload or short circuit.

Another object of my invention is to provide a relay of the above indicated charac-v -ter that shall be inexpensive to construct, compact in size and efficient and reliable in its operation.

In practising my invention,'I provide a combined line and overload relay for the motor circuit of an electric locomotive hav-' ing cooperating contact members for controlling the circuit of the actuating winding of the main line switch. Electromag- 3'5,

netiemeans-i's provided to efiect closure of E the contact members when the trolley is in; 'position. Other electromagnetic means is' provided. to effect the opening of the contact fgfme'mber's when an overload or an excess current obtains on'the motor circuit, and means is provided for holding the contact members inwtheir open position when opened by reason of an overload or a short circuit. lYIeans, suchast .a SPl'lIlg, is-provided for opening-, thecontagct members when the trolley p mps from. thetrolley conductor or when it crosses a break in ;the' same Sucha-device ates the necessityof employing separate line, a p p -tionary core member 10, one of the termlnals' 1 '1 overload. and-resetting relays and; has the advantage that economy of space and material, so essentialin electrically operated vehicles may bejobtained.

Fig re; 1, of v the accompanying drawings is a, view-,partially in elevat onand partially in section, of a relay embodying my inven-- my labs-a. mqlgomgmlr A enresmu OFVPENPSYIVPV pficiication of Letters Patent.

. ing device 2,. a relay 3, av h era-tedswitch 6 and a motor '7 bration'{ late is provided for indicating ,thesettingfof'thesame.

Application filed nine 13', 1917. seiiainoi lnnaa v a .tion,"illustrating its ccnneetion I were to be protected, and Fig. 2 a imntelev-aa t onal view of a portion of a moth-hm! form of relayembodying my invention.

A trolley conductor 1 is operativelv cw nected, through a trolley or current switch at, a controller-5,41%; ele

The relay 3-eornprises three A i 1 stationary magnetiz'able core members 8, 9

and 10, a movable magnetizable core member.

11 and two movable magnetizable nieinhers v 12 and 13. A winding 14, one1ter minal of which is connected to the collector device 2 through a conductor 15 and the othentermi nal of which is connected to ground through r a conductor 16', is adapted tocooperatewith. the core members 8 and 11v for thepnrposc, of actuating the movable core member "11 I when the trolley or collector 2 is imposition. and when current traverses-the'trolleyicom duct-or 1'. I 1 *j f The movable core member 11 is mountul on a rod 17 that extends through the ore members 8 and 9 and upon which lis als o mounted a bridging contactfmeiiiberl8 that I is adapted to cooperate with stationary eon-1 tact members 19 and 20-' The bridging con tact member 18 is resiliently connected to the rod 17 by a spring 21, and a spring 2211s disposed between a stationary member 2'3 and a shoulder 24 on' the rod 17 forothe pur 7 pose of holding the bridging contact memlien 18 and, consequently, the rod '17, in the position shown in the drawing when the winding 1.4 is not energize/d.

The movable magnetizable member '12 is vpivotally mountedon a pin 25 and is adapted 7 initial setting of the membe' ant 'cali- -100 J; 5

A winding ens disposed around-the Staswitch4. The movable contact member '29 of the switch 4 is connected to the'condu'ctor- 1.5 t ther station c ntact'me 30 of the said switchis connected to one terminal of the controller 5 the other terminalof which is connected to'the stationary contact member 19 of the relay 3. The movable magnetizable member 13 is pivotally mounted on a pin 31 and is provided with a latch device 32 that is adapted to engage energized by reason of the manipulation of the switch 4.

The winding 26 is operatively connected, at one of its terminals, to the conductor 15 and, at its other terminal, to the stationary contact member 34: of the switch 6. The other stationary contact member 35 of the switch 6 is connected to one terminal ofresistor 36 the other terminal of which 'is connected to one terminal of the motor 7. The other terminal of the motor 7 is connected, through a reversing switch 37 and the field winding 33 of the motor, to ground.

The Controller is adapted to control the closure of a plurality of switches 39 that aie connected across portions of theresistor 36 for the purpose of controlling the current through the motor 7 and, consequently, its speed. The switch 6 comprises a movable bridging member 40, a magnetizable core member 41, a winding 42 and the stationary contact members 34: and 35. One terminal of the winding is connected to the stationary contact member 20 of the relay 3 and the other terminal of said winding is connected to the conductor 16.

Vhen the current-collecting device or trolley 2 is disconnected from-the trolley c0nductor 1, the spring will hold the bridging contact member 18 in the posit-ion shown in the drawing, However, when the trolley 2 is placed in contact with the trolley conductor 1 and current traverses the said conductor, the winding 14; will be ener-' gized to move the core member 11 downwardly to such position that the bridging contact member 18 engages the stationary contact members 19 and 20. When the 0011-, tact members 18, 19 and 20 are engaged, the movable contact member 29 of the switch at is in engagement. with its stationary contact member 30 and the controller 5 is in the correct position, a circuit is completed from the conductor 1 through the controller 5 and the winding 42 of the switch 6. This will cause the bridging contact member 4C0 to engage the stationary contact membersifil and 35, and the motor 7 will be supplied with current which may be controlled by manipulating the controller 5.

If a predetermined excessive load s-taken by the motor 7, suflicient current will traverse the winding 26 to attract the movable magnetizable member 12. When the member 12 is moved into engagement with the stationary core member 9, it will engage the lower end of the rod 17 and effect disengagement of the bridging contact member 18, and stationary cont-act members 19 and 20. This will. open the circuit of the actuating winding '42 of the switch 6 and disconnect the 7 motor 7 from theclrc'uit. When the member 12 engages the core member 9, its projection 33 will be engaged by the latch member 32 to hold'the contact members 18, 19 and 20 in their openpositions. Ifjit is'desired to reset the device in order that, upon the cessation of the overload, the device will refunction, the movable contact member 29 of the switch l is moved into engagement with the stationary contact member 28. This completes a circuit from the conductor 15 through the winding 27 to the conductor 16 which causes the movable magnetiza'ble member 13 to be attracted to release the movable member 12 for the purpose of unlocking the rod 17.

After the winding 14 has been energized and the contact members 18', 19 and 20 are in engagement, if the trolley 2 jumps from the trolley conductor 1 or crosses a break therein, the winding let will be denergized and the spring 22 will move the rod 17 upwardly. to effect disengagement of the contact members 18, 19 and 20 and thereby open the switch 6, as hereinbefore set forth.

The force exerted by the member 12 must overcome the pull of the winding 14 on the member 11, but, in view of the fact that the overload setting of the winding 26 may be of such value that insufficient force is imparted to the member 12 to overcome the pull of the winding 14, means may be provided, as shown in Fig. 2 of the drawings,

for open circuiting the winding 14 as soon as the member 12 is actuated. That is, a stationary contact member 45 is substituted for the adjusting screw 43 shown in Fig. 1 of the drawingsand a resiliently mounted contact member 46 is so mounted that it is actuated by an adjusting screw 17 which is mounted in a projection 48 on the mem-v ber 12.

In the modified structure just mentioned, when the winding 27 is energized, the member 12 is permitted to assume such position that theflcontact members45 and 46 are in engagement and the circuit through the winding 14 is completed. By such an arrangement, the force exerted by the member 12 need not be of such value as to overcome the pull of the winding 14 on the member 11 because, as soon as the member '12 is actuated, the circuit of the winding 14 I claim as my invention:

1. A relay for an electric circuitcomprising "two relatively movable magnetizable members, a potential winding for actuating one of the members under predetermined normal conditions in the circuit, a current winding for actuating the other movable member when an overload traverses the circurt, and means actuated by the second movthe operatlonof able member for opposing the other movable member.

2. A relay foran electric circuit compris- ,ing two relatively movable magnetizable members, a Winding for actuating one of the movable members under predetermined normal condltions 1n the circuit, a second winding for actuating the other movable member when an overload traverses the circuit, and means actuated by the second mov-- able member for opposing the operation of the other movable member.

-3. A relay for an electric circuit comprising two relatively movable magnetizable members, means for actuating one of the members under predetermined normal conditions in the circuit, a second means for actuating the other movable member When an overload traverses the circuit, and means actuated by the second movable member for opposing the operation of the other movable member.

4. A relay device comprising cooperat ing contact members, means for effecting engagement of the contact members when the relay is connected in circuit under normal conditions, means for positively locking the contact members in their open position under predetermined conditions and means for unlocking the contact members.

5. A relay device for an electric circuit comprising cooperating contact members, spring-restrained means ftr eflfeoting engagement ofthe contact membe s under normal conditions in the circuit, means for positively locking the contact members in their open position when an overload traverses the circuit and electromagnetic means for unlocking the contact -members.

6. A relay for an electric" circuit comprising. two relatively'movable 1magnetizable members, stationary contact members, movable contact member's operatively connected to one of the movable magnetizable members, means for actuating one of the movable members to effect engagement of the contact members under normal conditions in the circuit, means for actuating the other movable;

member to disengage the contact members when an overload traverses the circuit and,

latching means for positively holding the second movable member. inits actuated position after the removalof the overload.-

I WALTER H. SMITH. 

